Convert Decimal -85 084 069 090 to Signed Binary in One's (1's) Complement Representation

How to convert decimal number -85 084 069 090(10) to a signed binary in one's (1's) complement representation

What are the steps to convert decimal number
-85 084 069 090 to a signed binary in one's (1's) complement representation?

  • A signed integer, written in base ten, or a decimal system number, is a number written using the digits 0 through 9 and the sign, which can be positive (+) or negative (-). If positive, the sign is usually not written. A number written in base two, or binary, is a number written using only the digits 0 and 1.

1. Start with the positive version of the number:

|-85 084 069 090| = 85 084 069 090

2. Divide the number repeatedly by 2:

Keep track of each remainder.

Stop when you get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 85 084 069 090 ÷ 2 = 42 542 034 545 + 0;
  • 42 542 034 545 ÷ 2 = 21 271 017 272 + 1;
  • 21 271 017 272 ÷ 2 = 10 635 508 636 + 0;
  • 10 635 508 636 ÷ 2 = 5 317 754 318 + 0;
  • 5 317 754 318 ÷ 2 = 2 658 877 159 + 0;
  • 2 658 877 159 ÷ 2 = 1 329 438 579 + 1;
  • 1 329 438 579 ÷ 2 = 664 719 289 + 1;
  • 664 719 289 ÷ 2 = 332 359 644 + 1;
  • 332 359 644 ÷ 2 = 166 179 822 + 0;
  • 166 179 822 ÷ 2 = 83 089 911 + 0;
  • 83 089 911 ÷ 2 = 41 544 955 + 1;
  • 41 544 955 ÷ 2 = 20 772 477 + 1;
  • 20 772 477 ÷ 2 = 10 386 238 + 1;
  • 10 386 238 ÷ 2 = 5 193 119 + 0;
  • 5 193 119 ÷ 2 = 2 596 559 + 1;
  • 2 596 559 ÷ 2 = 1 298 279 + 1;
  • 1 298 279 ÷ 2 = 649 139 + 1;
  • 649 139 ÷ 2 = 324 569 + 1;
  • 324 569 ÷ 2 = 162 284 + 1;
  • 162 284 ÷ 2 = 81 142 + 0;
  • 81 142 ÷ 2 = 40 571 + 0;
  • 40 571 ÷ 2 = 20 285 + 1;
  • 20 285 ÷ 2 = 10 142 + 1;
  • 10 142 ÷ 2 = 5 071 + 0;
  • 5 071 ÷ 2 = 2 535 + 1;
  • 2 535 ÷ 2 = 1 267 + 1;
  • 1 267 ÷ 2 = 633 + 1;
  • 633 ÷ 2 = 316 + 1;
  • 316 ÷ 2 = 158 + 0;
  • 158 ÷ 2 = 79 + 0;
  • 79 ÷ 2 = 39 + 1;
  • 39 ÷ 2 = 19 + 1;
  • 19 ÷ 2 = 9 + 1;
  • 9 ÷ 2 = 4 + 1;
  • 4 ÷ 2 = 2 + 0;
  • 2 ÷ 2 = 1 + 0;
  • 1 ÷ 2 = 0 + 1;

3. Construct the base 2 representation of the positive number:

Take all the remainders starting from the bottom of the list constructed above.

85 084 069 090(10) = 1 0011 1100 1111 0110 0111 1101 1100 1110 0010(2)

4. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 37.

  • A signed binary's bit length must be equal to a power of 2, as of:
  • 21 = 2; 22 = 4; 23 = 8; 24 = 16; 25 = 32; 26 = 64; ...
  • The first bit (the leftmost) indicates the sign:
  • 0 = positive integer number, 1 = negative integer number

The least number that is:

1) a power of 2

2) and is larger than the actual length, 37,

3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)

=== is: 64.


5. Get the positive binary computer representation on 64 bits (8 Bytes):

If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 64.


85 084 069 090(10) = 0000 0000 0000 0000 0000 0000 0001 0011 1100 1111 0110 0111 1101 1100 1110 0010

6. Get the negative integer number representation:

  • To write the negative integer number on 64 bits (8 Bytes), as a signed binary in one's complement representation,

  • ... Reverse all the bits from 0 to 1 and from 1 to 0 (flip the digits).


-85 084 069 090(10) = !(0000 0000 0000 0000 0000 0000 0001 0011 1100 1111 0110 0111 1101 1100 1110 0010)


Decimal Number -85 084 069 090(10) converted to signed binary in one's complement representation:

-85 084 069 090(10) = 1111 1111 1111 1111 1111 1111 1110 1100 0011 0000 1001 1000 0010 0011 0001 1101

Spaces were used to group digits: for binary, by 4, for decimal, by 3.

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How to convert signed integers from the decimal system to signed binary in one's complement representation

Follow the steps below to convert a signed base 10 integer number to signed binary in one's complement representation:

  • 1. If the number to be converted is negative, start with the positive version of the number.
  • 2. Divide repeatedly by 2 the positive representation of the integer number that is to be converted to binary, keeping track of each remainder, until we get a quotient that is equal to ZERO.
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above. Thus, the last remainder of the divisions becomes the first symbol (the leftmost) of the base two number, while the first remainder becomes the last symbol (the rightmost).
  • 4. Binary numbers represented in computer language must have 4, 8, 16, 32, 64, ... bit length (a power of 2) - if needed, fill in '0' bits in front (to the left) of the base 2 number calculated above, up to the right length; this way the first bit (leftmost) will always be '0', correctly representing a positive number.
  • 5. To get the negative integer number representation in signed binary one's complement, replace all '0' bits with '1's and all '1' bits with '0's.

Example: convert the negative number -49 from the decimal system (base ten) to signed binary one's complement:

  • 1. Start with the positive version of the number: |-49| = 49
  • 2. Divide repeatedly 49 by 2, keeping track of each remainder:
    • division = quotient + remainder
    • 49 ÷ 2 = 24 + 1
    • 24 ÷ 2 = 12 + 0
    • 12 ÷ 2 = 6 + 0
    • 6 ÷ 2 = 3 + 0
    • 3 ÷ 2 = 1 + 1
    • 1 ÷ 2 = 0 + 1
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above:
    49(10) = 11 0001(2)
  • 4. The actual bit length of base 2 representation is 6, so the positive binary computer representation of a signed binary will take in this case 8 bits (the least power of 2 that is larger than 6) - add '0's in front of the base 2 number, up to the required length:
    49(10) = 0011 0001(2)
  • 5. To get the negative integer number representation in signed binary one's complement, replace all '0' bits with '1's and all '1' bits with '0's:
    -49(10) = 1100 1110
  • Number -49(10), signed integer, converted from the decimal system (base 10) to signed binary in one's complement representation = 1100 1110